Improvement in screw-cutting machines



e. EMIG, SCREW-CUTTING MACHINE.

Patented Nov. 23, 1875.

".FETERS. PHOTO LTHQGRAPH WASHINGTON c and UNITED STATES PATENT QFFIICE.

GEORGE EMIG, OF CINCINNATI, OHIO.

IMPROVEMENT lhl SCREW-CUTTING MACHINES;v

Specification forming part of Letters Patent No. ['70, [60, datedNovember 23, 1875; application filed September 16,1875.

.To all whom it may concern:

Be it known that I, GEORGE EMIG, of Oincinnati, Hamilton county, Stateof Ohio, have invented an Improvement in Bolt and Screw Cutting Machine,of which the following is a specification My invention relates todevices for containing the dies and permitting the same to be repairedand replaced without readjustment, and also to the device for securingthe bolt and operating the bolt-slide; and my invention consist-s,first, in a two-part die-chuck, counterbored for the reception of atwo-part die-plate, and secured to and operated by arms or levers, in amanner hereinafter described.

My invention consists, in the second part, in the provision ofbolt-jaws, slide-wedge, and hinged lever, so arranged and connectedtogether that one of the jaws may be moved toward and from the other,and the bolt-slide moved by the same hand and motion.

Figure 1 is a perspective view of a bolt-cutting machine embodying myinvention. Fig. 2 is an elevation of the slide-wedge device foroperating the boltj'aws. Fig. 3 is aperspective view of one leaf of thedivided chuck.

A is the bed-of the machine, supporting the adjustable frames B B, whichuphold the bolt-clamps, and drill-chuck, and cone-pulley, respectively.Secured to the shaft 0 are the cone-pulleys D and collar E, the latterfitted to slide forward and backward on the shaft.

F is a rod for operating the said collar E, and it rests in a journal orbearing-post, f. To the end of shaft 0 is secured the head plate G, in

slots of which are secured or pivoted levers h h of the two-part chuck HH. When the parts H H are fitted together and in position they are heldthere by collar E, resting between the arms h h and can be opened orclosed by merely operating the collar E backward or forward. Thistwo-part chuck has a counterbored recess, h, to receive the members of adouble or two-part die-plate, I, which 7 are formed with shoulders '13,to coincide exactly with aforesaid counterbore. The diea plate issecured to the chuck by means of the bolts or screws '5. The arms h hare drawn toward each other, with a tendency to open or separate theparts of the chuck, by means of the spring J. Fitted to slide in frame Bis a plate, L, which carries the two jaws M M of the bolt or screwclamp, and to which is hinged a lever, N, for operatingit. The jaw M issecured rigidly to the plate B, while the jaw M is pivoted to it, so asto allowof lateral movements for clasping and releasing the bolt orscrew. Fitted upon the outer ends of the jaws M M are friction-rollers mm, between which plays the half-Wedge O in vertical motion. Thehalf-wedge is secured to the lever N, so that said lever can performthe.double operation of manipulating the feedslide L, and controllingthe grasp of jaws M M upon the bolt or screw to be cut. P is a springfor compressing the jaws against the wedge. The plate or slide L alsocarries a lever, Q, for opera-tin g the rod F at the proper time to openand close the chuck H H, which time is regulated by the movable collarsB It.

It is obvious that the friction-rollers can be dispensed with, and astationary friction-surface introduced instead.

By the application of the lever N, as above described, the operator canfeed up the bolt or screw, and, when finished, release it from the jaws,while the other hand is occupied in providing fresh bolts or material tobe out, and placing it in position, the device thus allowing of the mostcomplete and useful application of the labor of the operator.

Having thus described my invention, I desire to claim p 1. In ascrew-cutting machine, incombina tion with the two-part die-plate I i,the tWopart counterbored retaining-chuck H H h operating-arms h h andsupporting-plate G, the whole constructed to operate substantially asdescribed.-

2. In a screw-cutting machine, the combination of jaws M. M, lever N,wedge O, and spring P, all connected and operating substantially as andfor the purpose specified.

In'testimony of which invention I hereunto set my hand.

cnoacn EMIG.

